First four bells supplied in 1932 as
a "Westminster peal", including the
present bourdon. Keyboard on fifth
floor (bells inaudible here).

*Technical data:

Electric-keyboard chime of 10 bells
Pitch of heaviest bell is C in the middle octave
Transposition is unknown
Keyboard range: ---- / ----
The arrangement of tones and semitones is unknown.
The whole instrument was installed in 1950
with bells made by Meneely/Troy (except for 4 from 1932)
Year of latest technical information source is 2001

*Links:

The official Website of the City and County of Denver
apparently has nothing to say about the clock and chime.

News
article on a new tune composed for use on special events, with two photos of bells in the belfry.